lapacke_sbdsqr.c

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* Contents: Native high-level C interface to LAPACK function sbdsqr
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sbdsqr( int matrix_layout, char uplo, lapack_int n,
                           lapack_int ncvt, lapack_int nru, lapack_int ncc,
                           float* d, float* e, float* vt, lapack_int ldvt,
                           float* u, lapack_int ldu, float* c, lapack_int ldc )
{
    lapack_int info = 0;
    float* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_sbdsqr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( ncc != 0 ) {
            if( LAPACKE_sge_nancheck( matrix_layout, n, ncc, c, ldc ) ) {
                return -13;
            }
        }
        if( LAPACKE_s_nancheck( n, d, 1 ) ) {
            return -7;
        }
        if( LAPACKE_s_nancheck( n-1, e, 1 ) ) {
            return -8;
        }
        if( nru != 0 ) {
            if( LAPACKE_sge_nancheck( matrix_layout, nru, n, u, ldu ) ) {
                return -11;
            }
        }
        if( ncvt != 0 ) {
            if( LAPACKE_sge_nancheck( matrix_layout, n, ncvt, vt, ldvt ) ) {
                return -9;
            }
        }
    }
#endif
    /* Allocate memory for working array(s) */
    work = (float*)LAPACKE_malloc( sizeof(float) * MAX(1,4*n) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_sbdsqr_work( matrix_layout, uplo, n, ncvt, nru, ncc, d, e, vt,
                                ldvt, u, ldu, c, ldc, work );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_sbdsqr", info );
    }
    return info;
}